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Variable Speed parts?
- Thread starter JH225
- Start date
- Joined
- Jan 24, 2001
- Messages
- 501
I will answer your question w/ another one -- Do you want to use the same motor? If so, and it is single speed then you need a set of variable pulleys and likely to remount your motor so there will be a drive belt. You change from one size pulley to another to change speed. That will give you three different speeds.
Now if you want infinitly variable speed then your only choice is to purchase a DC motor and controller. Hope this helps.
Now if you want infinitly variable speed then your only choice is to purchase a DC motor and controller. Hope this helps.
- Joined
- Nov 25, 2000
- Messages
- 5,548
You will need a permanent magnet DC variable speed motor,HP of your choice,usually determined by the surplus $$ in your bank acct.If your current motor is bolted to the grinder by the face,you will need a "c" face motor w/56 frame TEFC=totally enclosed fan cooled is also another xlnt way to go,so you dont have to worry about metel dust shorting the motor out.Know what voltage you will be plugging this setup into,120 or 240v as your motor comes for one or the other.BTW,I would recommenend 11/2hp as a minimum, 2hp would be better.Next you need the solid state control unit,it is the part that plugs into your electrical circuit,and converts your shop/house ac current to DC,and then pumps it to the motor.It can be purchased with many features ie:forward/reverse,brake/run,for quick stop and then on again,the on or power switch.I have all these things,but I never use the reverse feature,it will be cheaper without it.You will be better off with a nema 12 enclosure for your controller,as it is dust tight,but you can get by w/a nema 1 enclosure,and seal it w/ silicone.Your controller usually comes dual voltage,ie: 120/240v.I would also recommend a heat sink for the controller,if one is offered.You will need crimp on wire terminals,wait till you get the controller to see what type/size,a crimper to install these,and you are almost ready to go.I hope this helps some,if you need any additional info,let me know.Almost forgot,controller will also have a speed control knob on it showing 0-100%,your motor rpm will dictate top speed.For example if you motor says 2500 rpm,it means 0-2500rpm,you can get higher belt speeds by the addition of 3 step pulleys,as in a conventional AC single speed motor.
You could use a Variable Speed Drive (VSD) with an appropriate 3-phase motor. There are VSD's available from a number of different manufacturers for "domestic" applications such as this (up to 3hp).
Here are some points to keep in mind if you are considering using a VSD. They come mostly from my coleagues who work in the Applications Department. I work in the R&D department of a company that manufactures VSD's. Don't let what I say discourage you from using a VSD. Just make sure that you find an electrician or electrical contractor with experience setting up industrial equipment so that the job is done safely and properly.
As MJHKNIVES said, keep them cool. Keep them away from dust and moisture, especially the metal dust, or they may go BANG. If you are going to seal it in a box, make it a big metal one. There is more surface area to get the heat out. It will keep the electrical noise in better too. Also, make sure that the VSD has sufficient capacity after derating due to the higher ambient temperature inside the box. Ensure that it is connected so that only one motor can be connected to the output at any one time. Otherwise, there are funny effects when starting a second motor while a first motor is running. Running multiple motors at one time will defeat any motor protection features that are built into the drive.
In some other post, someone said that VSD's may be purchased from farm supply stores. While this is true, you will not be able to get much help from them regarding how to connect it up and how to configure it. The industrial electrical suppliers will be able to sell you a VSD and should be able to get you in touch with someone to help you install it.
Shop around a bit. Most VSD's have the same basic functions, level of reliability and similar price. I do NOT recommend the models from the company that I am working for (EXTRAVERT from PDL). At about $1000 US dollars, they are more expensive that the competition and distribution and support in North America is still in its infancy. I also know that this particular product puts out a lot of Radio Frequency Interference (RFI). It will wipe out the radio and TV reception on your block. Some of the competitors have optional RFI filters that integrate very nicely. Paying a bit extra for shielded cable between the VSD and motor will help a lot. So will earthing the whole set up properly.
Make sure that the 3-phase motor you buy is rated for use with VSD's. Some cheap ones are not and will burn up after some time.
We have a drill press at work with a VSD connected to it. The motor speed is controlled with a multi-turn potentiometer (variable resistor). Very nice to use! Smooth start up and near instant stopping. I can hardly wait till I get my own shop set up.
Here are some points to keep in mind if you are considering using a VSD. They come mostly from my coleagues who work in the Applications Department. I work in the R&D department of a company that manufactures VSD's. Don't let what I say discourage you from using a VSD. Just make sure that you find an electrician or electrical contractor with experience setting up industrial equipment so that the job is done safely and properly.
As MJHKNIVES said, keep them cool. Keep them away from dust and moisture, especially the metal dust, or they may go BANG. If you are going to seal it in a box, make it a big metal one. There is more surface area to get the heat out. It will keep the electrical noise in better too. Also, make sure that the VSD has sufficient capacity after derating due to the higher ambient temperature inside the box. Ensure that it is connected so that only one motor can be connected to the output at any one time. Otherwise, there are funny effects when starting a second motor while a first motor is running. Running multiple motors at one time will defeat any motor protection features that are built into the drive.
In some other post, someone said that VSD's may be purchased from farm supply stores. While this is true, you will not be able to get much help from them regarding how to connect it up and how to configure it. The industrial electrical suppliers will be able to sell you a VSD and should be able to get you in touch with someone to help you install it.
Shop around a bit. Most VSD's have the same basic functions, level of reliability and similar price. I do NOT recommend the models from the company that I am working for (EXTRAVERT from PDL). At about $1000 US dollars, they are more expensive that the competition and distribution and support in North America is still in its infancy. I also know that this particular product puts out a lot of Radio Frequency Interference (RFI). It will wipe out the radio and TV reception on your block. Some of the competitors have optional RFI filters that integrate very nicely. Paying a bit extra for shielded cable between the VSD and motor will help a lot. So will earthing the whole set up properly.
Make sure that the 3-phase motor you buy is rated for use with VSD's. Some cheap ones are not and will burn up after some time.
We have a drill press at work with a VSD connected to it. The motor speed is controlled with a multi-turn potentiometer (variable resistor). Very nice to use! Smooth start up and near instant stopping. I can hardly wait till I get my own shop set up.